package com.java1224;

public class Java01 {
    public static void main(String[] args) {
        //变量和常量
        //变量可以变化的
        int a = 2;
        System.out.println(a);
        a = 3;
        a = 5;
        a = 7;
        //常量不能更改 ,final
        final int b=6;
        //b=5 不能改
        // 数字下划线
        int salary = 1_000_000_000;
        System.out.println(salary);

        //赋值运算符包含了自动运算转换

    }
}
